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Investigate impact of JVM bug regarding popCountInstruction and Long/Integer.bitCount #5659

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scabug opened this issue Apr 11, 2012 · 3 comments
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Investigate impact of JVM bug regarding popCountInstruction and Long/Integer.bitCount #5659

scabug opened this issue Apr 11, 2012 · 3 comments
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scabug commented Apr 11, 2012

As reported on IRC, there is a hard to catch JVM bug involving specific CPUs on which the JIT decides to emit a special popCount instruction:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7063674

This is an issue because we started to use the methods which cause the bugs (Long.bitCount, Integer.bitCount) in BitSet (see #2196).
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scabug commented Apr 11, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5659?orig=1
Reporter: @soc
Affected Versions: 2.10.0
See #2196

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scabug commented May 3, 2012

@paulp said:
I don't know how often this hits, but unless it is shown to be more common than my awareness would indicate, we don't have the resources to work around specific version jdk bugs. Patches welcome.

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scabug commented Aug 29, 2012

@soc said:
Fixed in 7u6.

@scabug scabug closed this as completed Feb 21, 2014
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